Loop Quantum Gravity (LQG)

A bold, background-independent approach to quantum gravity that quantizes space itself. It proposes that space is not a smooth continuum but a fabric woven from finite, discrete loops of excited gravitational field. These loops form a network called a spin network, representing the quantum state of space. The quanta of area and volume are predicted to have discrete, finite spectra, meaning there is a smallest possible unit of space. A key consequence is the resolution of the Big Bang singularity; instead of an infinitely dense point, LQG describes a Big Bounce, where a previous, contracting universe rebounded into our expanding one. It is a direct, geometric competitor to String Theory, focusing purely on quantizing Einstein's gravity without extra dimensions or supersymmetry.